As the amount of O2 that dissolves in the plasma increases, what is it directly proportional to?
a. Its partial pressure
b. Its solubility coefficient
c. Minute ventilation
d. Temperature
ANS: A
The relationship between partial pressure and dissolved O2 is direct and linear. By applying Hen-ry's law, the amount of dissolved O2 in the blood (at 37° C) can be computed with the following simple formula:
Dissolved oxygen (ml/dl) = PO2 ? 0.003.
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